net.cscott.jutil

Class HashEnvironment<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

net.cscott.jutil.HashEnvironment<K,V>

All Implemented Interfaces:

java.util.Map<K,V>, Environment<K,V>

public class HashEnvironment<K,V>
extends java.util.AbstractMap<K,V>
implements Environment<K,V>

A HashEnvironment is an Environment using a HashMap as the backing store.

Version:

$Id: HashEnvironment.java,v 1.6 2006-10-30 19:58:05 cananian Exp $

Author:

C. Scott Ananian

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

java.util.AbstractMap.SimpleEntry<K,V>, java.util.AbstractMap.SimpleImmutableEntry<K,V>

Nested classes/interfaces inherited from interface java.util.Map

java.util.Map.Entry<K,V>

Constructor Summary

Constructors

Constructor and Description
HashEnvironment() Creates a HashEnvironment.
HashEnvironment(java.util.Map<? extends K,? extends V> m) Creates a HashEnvironment with all the mappings in the given map.

Method Summary

Modifier and Type	Method and Description
void	clear() Clears all mappings.
boolean	containsKey(java.lang.Object key) Returns true if this map contains a mapping for the specified key.
MapSet<K,V>	entrySet() The Set returned by this method is really a MapSet.
V	get(java.lang.Object key) Returns the value to which this map maps the specified key.
Environment.Mark	getMark() Get a mark that will allow you to restore the current state of this environment.
static void	main(java.lang.String[] argv) Self-test function.
V	put(K key, V value) Associates the specified value with the specified key in this map.
V	remove(java.lang.Object key) Removes the mapping for this key from this map if present.
int	size() Returns the number of key-value mappings in this map.
void	undoToMark(Environment.Mark m) Undo all changes since the supplied mark, restoring the map to its state at the time the mark was taken.

Methods inherited from class java.util.AbstractMap

clone, containsValue, equals, hashCode, isEmpty, keySet, putAll, toString, values

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, containsValue, equals, forEach, getOrDefault, hashCode, isEmpty, keySet, merge, putAll, putIfAbsent, remove, replace, replace, replaceAll, values

Constructor Detail

HashEnvironment

public HashEnvironment()

Creates a HashEnvironment.

HashEnvironment

public HashEnvironment(java.util.Map<? extends K,? extends V> m)

Creates a HashEnvironment with all the mappings in the given map.

Method Detail

containsKey

public boolean containsKey(java.lang.Object key)

Returns true if this map contains a mapping for the specified key.

Specified by:

containsKey in interface java.util.Map<K,V>

Overrides:

containsKey in class java.util.AbstractMap<K,V>

get

public V get(java.lang.Object key)

Returns the value to which this map maps the specified key.

Specified by:

get in interface java.util.Map<K,V>

Overrides:

get in class java.util.AbstractMap<K,V>

put

public V put(K key,
             V value)

Associates the specified value with the specified key in this map.

Specified by:

put in interface java.util.Map<K,V>

Overrides:

put in class java.util.AbstractMap<K,V>

remove

public V remove(java.lang.Object key)

Removes the mapping for this key from this map if present.

Specified by:

remove in interface java.util.Map<K,V>

Overrides:

remove in class java.util.AbstractMap<K,V>

size

public int size()

Returns the number of key-value mappings in this map.

Specified by:

size in interface java.util.Map<K,V>

Overrides:

size in class java.util.AbstractMap<K,V>

clear

public void clear()

Clears all mappings.

Specified by:

clear in interface java.util.Map<K,V>

Overrides:

clear in class java.util.AbstractMap<K,V>

getMark

public Environment.Mark getMark()

Description copied from interface: Environment

Get a mark that will allow you to restore the current state of this environment.

Specified by:

getMark in interface Environment<K,V>

undoToMark

public void undoToMark(Environment.Mark m)

Description copied from interface: Environment

Undo all changes since the supplied mark, restoring the map to its state at the time the mark was taken. The undoToMark() operation must be repeatable.

Specified by:

undoToMark in interface Environment<K,V>

entrySet

public MapSet<K,V> entrySet()

The Set returned by this method is really a MapSet.

Specified by:

entrySet in interface java.util.Map<K,V>

Specified by:

entrySet in class java.util.AbstractMap<K,V>

main

public static void main(java.lang.String[] argv)

Self-test function.